Power Auras no longer seems to be able to "see" your Chi as a Monk after the 5.1 patch.
This is due to a strings change with path 5.1. Until the author, or someone else, decides to work on PA or release a new version there is a somewhat simple fix (this fix applies to v5 ONLY):
Open WoW Folder\Interface\Addons\PowerAuras\Constants....